<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="js/vue.js"></script>
</head>
<body>
    <div id="app">

    </div>
    <script>
        var vm=new Vue({
        el:'#app',
        data:{
           firstName:'Foo',
           lastName:'Bar',
           //fullName:'Foo Bar' //验证计算属性时，本语句需要注释掉
        },
        watch:{
            firstName:function(val){
                this.fullName=val+''+this.lastName;
            },
            lastName:function(val){
                this.fullName = this.firstName+''+val;
            }
            },
            computed:{
                fullName:{
                    //getter
                    get:function(){
                        return this.firstName+''+this.lastName;
                    },
                    //setter
                    set:function(newValue){
                        var names = newValue.split('');
                        this.firstName=names[0];
                        this.lastName=names[names.length-1];
                    }
                }
            }
        })
    </script>
</body>
</html>